affine interpolation per blocks
This commit is contained in:
Bigfoot71
parent
23efe6decf
commit
a31fecf0b9
179
src/external/rlsw.h
vendored
179
src/external/rlsw.h
vendored
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@ -5259,16 +5259,11 @@ void swGetFramebufferAttachmentParameteriv(SWattachment attachment, SWattachget
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static void SW_RASTER_TRIANGLE_SPAN(const sw_vertex_t *start, const sw_vertex_t *end, float dUdy, float dVdy)
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static void SW_RASTER_TRIANGLE_SPAN(const sw_vertex_t *start, const sw_vertex_t *end, float dUdy, float dVdy)
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{
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{
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// Gets the start and end coordinates
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// Gets the start/end coordinates and skip empty lines
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int xStart = (int)start->coord[0];
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int xStart = (int)start->coord[0];
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int xEnd = (int)end->coord[0];
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int xEnd = (int)end->coord[0];
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// Avoid empty lines
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if (xStart == xEnd) return;
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if (xStart == xEnd) return;
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// Compute the subpixel distance to traverse before the first pixel
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float xSubstep = 1.0f - sw_fract(start->coord[0]);
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// Compute the inverse horizontal distance along the X axis
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// Compute the inverse horizontal distance along the X axis
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float dxRcp = 1.0f/(end->coord[0] - start->coord[0]);
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float dxRcp = 1.0f/(end->coord[0] - start->coord[0]);
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@ -5288,6 +5283,9 @@ static void SW_RASTER_TRIANGLE_SPAN(const sw_vertex_t *start, const sw_vertex_t
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float dVdx = (end->texcoord[1] - start->texcoord[1])*dxRcp;
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float dVdx = (end->texcoord[1] - start->texcoord[1])*dxRcp;
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#endif
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#endif
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// Compute the subpixel distance to traverse before the first pixel
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float xSubstep = 1.0f - sw_fract(start->coord[0]);
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// Initializing the interpolation starting values
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// Initializing the interpolation starting values
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float w = start->coord[3] + dWdx*xSubstep;
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float w = start->coord[3] + dWdx*xSubstep;
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float color[4] = {
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float color[4] = {
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@ -5312,77 +5310,126 @@ static void SW_RASTER_TRIANGLE_SPAN(const sw_vertex_t *start, const sw_vertex_t
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uint8_t *dPtr = (uint8_t *)(RLSW.depthBuffer->pixels) + baseOffset*SW_FRAMEBUFFER_DEPTH_SIZE;
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uint8_t *dPtr = (uint8_t *)(RLSW.depthBuffer->pixels) + baseOffset*SW_FRAMEBUFFER_DEPTH_SIZE;
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#endif
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#endif
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// Scanline rasterization
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#define SW_AFFINE_BLOCK 16
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for (int x = xStart; x < xEnd; x++)
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int x = xStart;
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while (x < xEnd)
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{
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{
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float wRcp = 1.0f/w;
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// Clamp last block to remaining pixels
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int blockEnd = x + SW_AFFINE_BLOCK;
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if (blockEnd > xEnd) blockEnd = xEnd;
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float blockLenF = (float)(blockEnd - x);
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float blockLenRcp = 1.0f / blockLenF;
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// Only 2 '1/w' here; none inside the pixel loop
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float wRcpA = 1.0f / w;
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float wB = w + dWdx*blockLenF;
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float wRcpB = 1.0f / wB;
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// Perspective-correct color at both block endpoints, then affine gradient
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float srcColor[4] = {
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float srcColor[4] = {
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color[0]*wRcp,
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color[0]*wRcpA,
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color[1]*wRcp,
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color[1]*wRcpA,
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color[2]*wRcp,
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color[2]*wRcpA,
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color[3]*wRcp
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color[3]*wRcpA
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};
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float dSrcColordx[4] = {
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((color[0] + dCdx[0]*blockLenF)*wRcpB - srcColor[0])*blockLenRcp,
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((color[1] + dCdx[1]*blockLenF)*wRcpB - srcColor[1])*blockLenRcp,
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((color[2] + dCdx[2]*blockLenF)*wRcpB - srcColor[2])*blockLenRcp,
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((color[3] + dCdx[3]*blockLenF)*wRcpB - srcColor[3])*blockLenRcp
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};
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};
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#ifdef SW_ENABLE_DEPTH_TEST
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#ifdef SW_ENABLE_TEXTURE
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// Perspective-correct UVs at both endpoints, then affine gradient
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float uAffine = u*wRcpA;
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float vAffine = v*wRcpA;
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float dUaffine = ((u + dUdx*blockLenF)*wRcpB - uAffine)*blockLenRcp;
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float dVaffine = ((v + dVdx*blockLenF)*wRcpB - vAffine)*blockLenRcp;
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#endif
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// Inner span pixel loop
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for (; x < blockEnd; x++)
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{
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{
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/* TODO: Implement different depth funcs? */
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#ifdef SW_ENABLE_DEPTH_TEST
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float depth = SW_FRAMEBUFFER_DEPTH_GET(dPtr, 0);
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{
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if (z > depth) goto discard;
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float depth = SW_FRAMEBUFFER_DEPTH_GET(dPtr, 0);
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if (z > depth) goto discard;
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SW_FRAMEBUFFER_DEPTH_SET(dPtr, z, 0);
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}
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#endif
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/* TODO: Implement depth mask */
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#ifdef SW_ENABLE_TEXTURE
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SW_FRAMEBUFFER_DEPTH_SET(dPtr, z, 0);
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{
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float texColor[4];
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sw_texture_sample(texColor, RLSW.boundTexture, uAffine, vAffine, dUdx, dUdy, dVdx, dVdy);
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float finalColor[4] = {
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srcColor[0]*texColor[0],
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srcColor[1]*texColor[1],
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srcColor[2]*texColor[2],
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srcColor[3]*texColor[3]
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};
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#ifdef SW_ENABLE_BLEND
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{
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float dstColor[4];
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SW_FRAMEBUFFER_COLOR_GET(dstColor, cPtr, 0);
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RLSW.blendFunc(dstColor, finalColor);
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SW_FRAMEBUFFER_COLOR_SET(cPtr, dstColor, 0);
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}
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#else
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SW_FRAMEBUFFER_COLOR_SET(cPtr, finalColor, 0);
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#endif
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}
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#else
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{
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#ifdef SW_ENABLE_BLEND
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{
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float dstColor[4];
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SW_FRAMEBUFFER_COLOR_GET(dstColor, cPtr, 0);
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RLSW.blendFunc(dstColor, srcColor);
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SW_FRAMEBUFFER_COLOR_SET(cPtr, dstColor, 0);
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}
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#else
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SW_FRAMEBUFFER_COLOR_SET(cPtr, srcColor, 0);
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#endif
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}
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#endif
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discard:
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srcColor[0] += dSrcColordx[0];
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srcColor[1] += dSrcColordx[1];
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srcColor[2] += dSrcColordx[2];
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srcColor[3] += dSrcColordx[3];
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cPtr += SW_FRAMEBUFFER_COLOR_SIZE;
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#ifdef SW_ENABLE_DEPTH_TEST
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{
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z += dZdx;
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dPtr += SW_FRAMEBUFFER_DEPTH_SIZE;
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}
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#endif
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#ifdef SW_ENABLE_TEXTURE
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{
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uAffine += dUaffine;
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vAffine += dVaffine;
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}
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#endif
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}
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}
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#endif
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// Advance perspective-space accumulators by the full block width
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w = wB;
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color[0] += dCdx[0]*blockLenF;
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color[1] += dCdx[1]*blockLenF;
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color[2] += dCdx[2]*blockLenF;
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color[3] += dCdx[3]*blockLenF;
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#ifdef SW_ENABLE_TEXTURE
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#ifdef SW_ENABLE_TEXTURE
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{
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u += dUdx*blockLenF;
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float texColor[4];
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v += dVdx*blockLenF;
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float s = u*wRcp;
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float t = v*wRcp;
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sw_texture_sample(texColor, RLSW.boundTexture, s, t, dUdx, dUdy, dVdx, dVdy);
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srcColor[0] *= texColor[0];
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srcColor[1] *= texColor[1];
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srcColor[2] *= texColor[2];
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srcColor[3] *= texColor[3];
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}
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#endif
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#ifdef SW_ENABLE_BLEND
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{
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float dstColor[4];
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SW_FRAMEBUFFER_COLOR_GET(dstColor, cPtr, 0);
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RLSW.blendFunc(dstColor, srcColor);
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SW_FRAMEBUFFER_COLOR_SET(cPtr, dstColor, 0);
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}
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#else
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{
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SW_FRAMEBUFFER_COLOR_SET(cPtr, srcColor, 0);
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}
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#endif
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// Increment the interpolation parameter, UVs, and pointers
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discard:
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w += dWdx;
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color[0] += dCdx[0];
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color[1] += dCdx[1];
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color[2] += dCdx[2];
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color[3] += dCdx[3];
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cPtr += SW_FRAMEBUFFER_COLOR_SIZE;
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#ifdef SW_ENABLE_DEPTH_TEST
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{
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z += dZdx;
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dPtr += SW_FRAMEBUFFER_DEPTH_SIZE;
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}
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#endif
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#ifdef SW_ENABLE_TEXTURE
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{
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u += dUdx;
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v += dVdx;
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}
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#endif
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#endif
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}
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}
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#undef SW_AFFINE_BLOCK
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}
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}
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static void SW_RASTER_TRIANGLE(const sw_vertex_t *v0, const sw_vertex_t *v1, const sw_vertex_t *v2)
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static void SW_RASTER_TRIANGLE(const sw_vertex_t *v0, const sw_vertex_t *v1, const sw_vertex_t *v2)
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